72222292 has 12 divisors (see below), whose sum is σ = 128461396. Its totient is φ = 35519040.

The previous prime is 72222289. The next prime is 72222299. The reversal of 72222292 is 29222227.

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 71132356 = 1044^2 + 8434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72222292.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147753 + ... + 148240.

Almost surely, 2^72222292 is an apocalyptic number.

It is an amenable number.

72222292 is a deficient number, since it is larger than the sum of its proper divisors (56239104).

72222292 is a wasteful number, since it uses less digits than its factorization.

72222292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296058 (or 296056 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 72222292 is about 8498.3699613514. The cubic root of 72222292 is about 416.4444599368. Note that the first 4 decimals are identical.

The spelling of 72222292 in words is "seventy-two million, two hundred twenty-two thousand, two hundred ninety-two".